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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ae5d2a7ef405522468d75a3cc7e6398e63f8d7bb7e92c7f762a5c3eafd3305' 
  AND token = 'XcHauTs8XrL/lnRhNZVmPKvS3HU+ezHQtNzEYbTmkrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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