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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c38203a10badbe3125a89e1b112884858809028540d8a2cdf0c433d12609bc7' 
  AND token = 'l9T+h291YX6z5xp/4pU3Mz4xaBU8HoO8WJrsjkNs+c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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