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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478831df2044bf4e8958cc4adcdb6c60dd05d804fab7929360d8198d1fddb17b' 
  AND token = 'kzbkf1MCtX4mvPeOPpTP7bAx+JA90AJnohEYhv5uiTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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