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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d73372ab203decbc69f54de9eb9c97d27bb377411341d65c7aeca3c9c08c57d' 
  AND token = 'BwMQNw+J+XntEDPHV1WP8LO/UN1cUIO0CwrhrUqX9v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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