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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e46d04380117708b6aac4ae905e5df1f38bc8fe8629310dd266b2f4416d839' 
  AND token = 'WOazRU5azEYO4Z9oVVwMXeNVQQLl+/RQAmrlDZbVJII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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