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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa876a72a4ff828e907b1b6a19878599b446eb9f6a30cf0184306fa09ef14ec' 
  AND token = 'uEpGSvMWBf3pi7a5Vu4/H/ZEe2+T4frDAjQoKRaey1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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