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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5151f7dd55bee8c44d7452e561f2a9d696fef47575cd393b1c638502cecc4834' 
  AND token = 'ROKdWxaMl92ft3FPZnxoYDAqKkgdR804kZtDLUmjq2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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