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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c095d00aefceb1193c2cefb49ca3f985c5fa13b2079e76532a81fd324be9e7c5' 
  AND token = '98w4+0ejlPAqa4xMnKhZxz9M3djCs7UnTeeeZ8Jawnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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