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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3cf859da170dab7dc247a8831a65d625e4cd035bc57753fca85f4a61abce21' 
  AND token = '96PrUSE50uiLaq6f5KCaY2a0aNYE1rHMRmLUWF9UV8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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