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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1670217145cbc047427af935ce219c8c7357a06e7686a7e5f4a7c023257e2a' 
  AND token = 'Nu1T+T8Yps/AnMGlIhmiV4S73ABqY6m8VNkpcG1hZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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