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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23a16c17d5ca7ede32c885e8e80492b6d0e06880d776234a25bd30c937c82a5' 
  AND token = 'q3Z9VIctTWaUYApK7Y+UoDteLlE+vaW0Gvmek0dwJdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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