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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2fa3532c2cde4dba9b354d29e265fb711bbf68da7712270bebecc137918567' 
  AND token = 'qN1wjh5RiCF1JYWr/IyeFTTSuCpkzODF910uH/sFyeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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