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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda67bfebbb08f3dfdf31b1537c86e631887ff5150bff5d71355877b52e66098' 
  AND token = 'xem3ku6QUnLwRYS9+cWd5C1wXLEhWJMTYhpek9QOJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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