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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3684ebf87dc31af772893a8ce5ea62e9f7a3f84b4c5a0fad954d3e133a5b6334' 
  AND token = 'SI0DPv9ATa+7B7EFRlWxcEaKsqeSwGcSkEmTu4GJVWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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