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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e20947e4c8d913ef5676fb5067bc5894154f778ca72390f654074933022bbe' 
  AND token = 'Up/EsbLaE3lhmUei7C6DjFAIuyqkTFKIH6LcIc3sijU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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