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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835863ef66578794730d6ffc484959c44052ddd53d838bd8538eab66ebc7299d' 
  AND token = '/cKd01ADiNcGsnycPbALW+q9gtHe1hBuhFE3nKXB/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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