Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfa19341b8389cd7b57818163761734e4b192a8595eb48eb87e867f9e78ee6e' 
  AND token = 'JMAfAHZjtbUd8bL9f38h6QtkqeQ8B+BOO5ntItijEaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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