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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6247ce29a8c821c300498d25d7a6b36a40217f9c8c18bcd2d4947188fd8bd541' 
  AND token = '2KSrSO3J86rtzWD5q3l3ejZeST2zn41nhXQNp59oGxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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