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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ab9efd780453dc6c363fea1120c54098e1ad325128ec7de7f5f583e2cab82e' 
  AND token = 'pdODxslgD2XodF60SiskBaXWsHCeKa46Enkuh+oZK2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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