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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc1a367680d7bdc7abb7758c2d86bfda231b1d9d242e56bf58864cd3677a12a' 
  AND token = 'dM0cljeZrLTUmUi0Uq/5Xk9wdCYFA3/zC36DQxWDfIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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