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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24da6dedb0cecb1ffbff53fae5cf5ff559d0f4766216468e15b51daf11765a29' 
  AND token = 'k3YP1L57vUz7lEo96Zm8/GlxAl6LWSH+CdIAsNCbTRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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