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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a504a29897531f853606c13a19b07cf940a6fc5ebe809f3938c275784dfb7cbc' 
  AND token = '8DtoFGeKztGHLpJeLAOmLjlq6KJ05yu73WLMK+Si8qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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