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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1b4c21e50f5c3af6b4cd3562a6a947f584af15c7d342154bd6dafedc81effc' 
  AND token = 'eMJYWG61WCNjGL4TWy5On08+HGJH64CgBCRjor4EsGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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