SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653e74cd6d48c5048b93fad2bac8e173bf0086bf12fd82495097a55f05b43c70' 
  AND token = 'iqB9d5WDtZJJsAVqtwppu6FtCnQQCCqHXyvw87yKx3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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