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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8732359799c92e8896155cc5630d125ce45eac2d5ffefe21f49b039712e06baa' 
  AND token = 'Tn7Kz5HSte9uq3SMG3cmoVXHuXLaZ0II9BFsk7qX/IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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