SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eeb8e60e2808f09670c8998d685b21b9baf63db7112c97bb3437f79c472dfa9' 
  AND token = 'CR+zgVBCAxphu2l0JFG3f1bB/VnKoGME3hKfifYUm1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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