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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0964823304572c8ba6dd64745042aa9dda2fccc83b27e549c49f8bba64846107' 
  AND token = 'rQrMC5ul7kc5SGNypLNOiDp6BVwCGDSccV1FG1oq76M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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