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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e6d37a440ce77a9ca5451d36a50b518f3ab946b320a070a1e258762d88c6ee' 
  AND token = 'n8Uytg1CiJbsq3LXkRaaCWsCeENiuhf8dHTVQwD6QX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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