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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92d55e158d5dfdfe03647d741425520656769baa1d051c055476aef5b20f280' 
  AND token = 'vARE7jX+Xk3DhRM33Yg594RpHWRU9O1aStOKLIAp1pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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