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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67eca0f5175c74c223f329e034fe91b7ac6b7fb6724b80c6eb8b27e3d049f53' 
  AND token = 'wmvq7SrTvIE/JiMgxeCIuqUt4Yo5uO6J8RbivNJYQFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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