Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c367455922b5eb65b2e07b892d6cbbdc8b0d0e5df9202f8ede8ecc75dcd1b801' 
  AND token = 'u1YEkqV6cjgJVNfSUuBiAbIdsg9Awycfl52KleMh2Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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