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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90333782b8e1c7efd2f07be728b9998569faa9e8db8f236f3554e59c5d736c24' 
  AND token = '4wvy9+DaE7bQHI3+gTVM1nWOGccjYgWgE23mMJ+g920=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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