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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cfce47403741e95bc45ce32b12f306716028e685b7f5eeac910edb0548c6cc' 
  AND token = 'dBlHPgvE9S8fbPUtlwtTf/SHuy3wLYBkCjqRUVfHOJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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