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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ec82bd717f942a47809fd070bfa9d59fc2bfdcce31f1e2d9a7115b8bb92256' 
  AND token = '1CEN66IYkvkFx+f3m3HrUSeI12elrG3jpiknBrSPDYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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