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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c775449b9e26eeb12b6eeca941d20cecb9489bb10734c31fe19f95ae073c182' 
  AND token = 'VrJcuzN7ro2Q53l2qjQRSNXJNLLFofa0uqKJ8aE+B/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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