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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8454e86456eebd31fc04a90046ef3f1e47a40f6ab6aa636e1baaf50cd2e705f' 
  AND token = '9Bxa8SfB3wJ/JlJM2D2vtO15YyHDqQ85ecATfxph0dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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