SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2062e275f1153fd2555446870f63b9ff732f6157b848c914813ba855f418d5f' 
  AND token = '9pFLwwCg9rlgR91+Srer0YO/Ie6JBz0hnAU2LHkBgVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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