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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bb1fd65c565c37d60f2341a973eae9e82f228f09657ff68c1a124b923e7895' 
  AND token = 'adk9Qktiv0fFtqTr5VOO1GXdfSobt9Pwy6oZLPNWyLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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