SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c44f2fc12c72cc903a75c9651b4337c00edac4d77deaeffdbf7db5b61e0745' 
  AND token = 'x9hIswzEmM/cvDlngQClxq4K05JNJFqU6j/UGu35wSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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