SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96801dd0c902508b15b9b8ad34f7e24c113f1664c989b35d3594c10a9d12a19b' 
  AND token = 'tpjXJn1VRLaoqjWXMcrs/5Ync7zNSqPLzGfgBuKKyok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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