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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662c8b024f4ba971e00ed98b1b6c5456eb7a412ab6d6589379a4641c9940a09c' 
  AND token = 'VZTzRJtW1K/DQd8jtlEIsbxY0B6fMtrqMNiItBnURwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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