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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681bc8591a07fa25638972f3e363bf93b28ddf107fd6ffd6c5981107853e8fa6' 
  AND token = 'qxWnxWmwPkgit7WCM+LRoSMHo4nVrGI5q0ijcz7Wk6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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