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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d313420e1379ba701be9fa574eaea31270120e42ca711a87ecf149da8307d9f' 
  AND token = 'UblMWDVKVy6QG31CoyIZmm/h/3elzP+prFWEp50aIAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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