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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f11f232327537f58614b1a76cbe741d55047ef9427328783704b70d0ac3fbf9' 
  AND token = 'OGtjwz5HZa7XXea5uCPlrTwDBrG/DdaTzVI8XQExvRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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