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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf4fa8ab6fbaa1746605d6887bb074e977303ceaf9e771d04cfca1ef5dced5f' 
  AND token = 'f8xrwYd23Xtnjv9b3C+ACm2G6rIePbhpL5gcGjGuHHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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