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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8838594b340fbfb3a6e0df0dc3b9b6f8538c73b1a5c49e53308c1544a9434eb2' 
  AND token = 'PqD4kLOEpKZYDQPOdkWqH5FLBQlQ7ZoRbN6nJ55wnG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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