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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a949857eee6866dd3d35c4645e37b9bcb4e1cd05acdd74dea3ea6bcdeb634c69' 
  AND token = 'sPgJ84mOHMLh0pbMKPEfenyPu8d1FcIMlyZaKB/Vzcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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