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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83010d08af1d8730b15899d113ff0f763866ba36755083c849e0e79bd723dcf' 
  AND token = '+2i8aOcUmbRWvD33egqRU71u9GU921zU3MQtPr9r8oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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