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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23cae6fbead46402881ea31d78e1f1ca6caa5b5c6ebc8dae922ec89c15437bc' 
  AND token = 'URZKuTG1GAfWEQtDrxJFARVhYgXyDOMMZitnhAQbXsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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