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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d1405a5fabaff3ce0e711dcfb0ad61cd5a8c75f8a53ecc9579ba16ff54ceba' 
  AND token = '2jKpFiVcfI8EjRVMtSrvEJCZXePCryyNeMRBHLoMgvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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