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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e2532b4ac0921169cc349674f4aa76cde84e06d9f68199b017e1daa064aac1' 
  AND token = 'KmSvXlOALgYvilVThcn/Acf09wf1l2BtpeAOnbsVqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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