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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a76df5b21387caf0540f63e8230a70b73efa98a0ec17767db8f25f85447389' 
  AND token = '2tZ3yS6DZ509Mq3zduX45achrNKhKfZwRyj5pLMjC8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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