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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d7cb908ad9ff1fd928c82058113bbd2d9f13879a60033c3eb3ccc80f9d4dde' 
  AND token = 'z8Vmsyjpl/ixsXzluTHT9p53+mnqJEkw+niQpoTBoyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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