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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05291744f5129a354e4c4af98949653f51741807928e7aec691b8db154da9f2' 
  AND token = 'HzefcCSPX00HwmI4FclUhWdi+XGmTm63BdfHEH0XdgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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