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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1ff73ec614cfbd8cf248a4c7a393b37f5ae202721938274fd4e34cee53a979' 
  AND token = '4d0Jn4NRC7DT24Z9BEodX+pmFwe+uhtKX4eeblmyPds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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