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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98918cf06d58f8597e3ade886244026c32ba6a1b257261ca997c121f923b6cba' 
  AND token = '3+V26hDeM8urNIqmxBiJBClxR0SVvB+tHUIdRD0Qxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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