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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da251031102f01d09e89cbb4c37d1b55d76fe4d65b52f169ee7232c017ffe6a8' 
  AND token = 'TUS5QObBM7y1T7wHuf8Ce3GIpf71qpISfH7ZhS7neGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}