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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47928da1277569144aae439713ca6c11ab3bac49785c2dbe59dd32b64681d20c' 
  AND token = 'UzB8jC3NEgFbdsbOEXqdJg1p260UQD7ANsU6jMZz30k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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