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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc95612fae6950fce39f9424c6bbdb5328c5ec1546ce91537a5ceeea1dcb3055' 
  AND token = '10ptFWIlPXQ/cNrMes+QU1YOqu1YWEhGYd01ZXV+HPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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