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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e163559901773503b065ba5e388ff935c20031c7bbd4b94a383e4bd87aa378a' 
  AND token = '8QwgzcKKT2iNuh01V5IVuwl01L8D/bFhkW767QLSThU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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