SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc91f14994e5b388cf88b26f0c39709764bdf9842a0cd2f327668c2f57f52b86' 
  AND token = 'PNuCMOsUGdhNncK/ERJoWiHeBzriEvGhhzNbWbxHugI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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