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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5f394886151885e5be1d96d5b937a79e56f5738acd58ce031b5cb7eec1abd1' 
  AND token = 'tYWWMZSGsnO0WxrBtRwE/5OZfQ3cpmuuFO59Lf8qVHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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