SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f51407f227e23fa66949567df13e5c14a36309c4a47fc28bfc0a04e244cacf0' 
  AND token = 'hqRqbwPHYF54VnWB31o+gIfXhQdUvtbS92P+NgQGzkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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