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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d1299f30646e061b291f571c6875486d78b12dd06fe1199c2a66d41f1ed05d' 
  AND token = 'zXb9JfXVE6t1nogJw4CzUoMuc2duYN92WVJ5Wq9jusI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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