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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ede89760586cea3f91632ad9f2b61c734dc45d8ff3706ad298772d2f226294' 
  AND token = 'iOt6m9Ckm2H9A4niPYJmVOZ9kbJ568uhJHEZBG2L+U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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